Compress PDF Online
Compress PDF online with ContinuePDF — no installer, no plug-in, no desktop software to keep updated. The whole tool loads as a web page, so you can compress your PDF straight from any computer or phone that has a browser. Because the work runs on your own machine instead of a remote server, you get desktop-class speed without the desktop-class download.
Start Compress PDF NowHow to Compress PDF Online
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Open the tool in your browser
Go to continuepdf.com and open Compress PDF. There is nothing to install — the page is the app.
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Add your PDF
Drag files onto the page or click to browse. Everything loads into the browser tab, not a server.
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Compress PDF and download
Run the tool and save compressed PDF to your device. The result is generated locally and downloaded instantly.
What you can do with Compress PDF
Compressing rewrites a PDF so it takes up less space — mainly by optimising embedded images and stripping redundant data — making the file easier to email, upload, or store.
Get under an email limit
Shrink a photo-heavy PDF so it fits within a 10 MB or 25 MB attachment cap.
Speed up a web upload
Reduce a large scan before submitting it to a government portal, job application, or loan form that rejects big files.
Save storage space
Compress archived documents so a folder of scans takes a fraction of the disk or cloud space.
Share faster
Send a lighter file that downloads quickly for recipients on slow or mobile connections.
Why an online Compress PDF tool beats desktop software
Traditional PDF programs like Acrobat or dedicated compress utilities have to be downloaded, installed, licensed, and updated — and they only work on the one machine you installed them on. An online tool skips all of that: open a URL and you are working. That matters most on borrowed, locked-down, or brand-new computers where you can't install anything.
The usual trade-off with "online" tools is privacy, because most of them upload your document to a server to process it. ContinuePDF is different — the compress operation happens inside your browser using JavaScript and WebAssembly, so your PDF never leaves your device even though the tool lives on the web. You get the convenience of online with the privacy of offline.
Why choose ContinuePDF
Nothing to install
Works the moment the page loads — no setup, no admin rights.
Any device
Compress PDF from a laptop, desktop, tablet, or phone with the same link.
Always up to date
You always run the latest version — there is no old build to patch.
Processed locally
Online convenience, but files stay in your browser, not on a server.
Pro tip
Most of a PDF's size usually comes from scanned pages and embedded photos, not text. If a file is still too big after compressing, check whether it is a scan — reducing image resolution has the biggest effect, while a text-only PDF is already small.
Frequently asked questions
Will compressing make my PDF look worse?
At a moderate level, text and vector graphics stay sharp and the savings come from optimising images, so documents still look clean. The strongest setting works harder — it can even convert pages to images to shrink the file further, which softens photos and makes text non-selectable — so choose a moderate level when you need to keep text crisp and selectable.
Why didn't my PDF get much smaller?
If the file is mostly selectable text, it is already efficient and there is little to remove. The biggest savings come from PDFs built around high-resolution images or scans.
Do I need to install anything to compress a PDF online?
No. Compress PDF runs entirely as a web page. You open the link, add your PDF, and download compressed PDF — there is no program to download, no extension to add, and no account to create.
Does an online tool mean my file is uploaded somewhere?
Not with ContinuePDF. Although the tool is delivered over the web, the actual processing runs inside your browser on your own device. Your document is never transmitted to or stored on our servers.
Is ContinuePDF free to use?
Yes. ContinuePDF and all of its tools, including Compress PDF, are free with no signup required. Because documents are processed in your browser rather than on our servers, we can offer the full feature set at no cost.
Other ways to Compress PDF
Prefer a different device, browser, or setup? Compress PDF works the same everywhere.
Ready to Compress PDF?
Start using our free compress tool now — no signup required.
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